HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES

被引：47
|
作者：
Nalewajko, Krzysztof [1 ]
Sikora, Marek [2 ]
Madejski, Greg M. [3 ]
Exter, Katrina [4 ]
Szostek, Anna [3 ,5 ]
Szczerba, Ryszard [6 ]
Kidger, Mark R. [7 ]
Lorente, Rosario [7 ]
机构：
[1] Univ Colorado, Boulder, CO 80309 USA
[2] Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
[3] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
[4] Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Louvain, Belgium
[5] Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland
[6] Nicolaus Copernicus Astron Ctr, PL-87100 Torun, Poland
[7] ESAC, Herschel Sci Ctr, E-28691 Madrid, Spain
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 760卷 / 01期
基金：
美国国家科学基金会;
关键词：
galaxies: active; galaxies: jets; gamma rays: galaxies; infrared: galaxies; quasars: individual (PKS 1510-089); radiation mechanisms: non-thermal; LARGE-AREA TELESCOPE; 3C; 454.3; MULTIWAVELENGTH OBSERVATIONS; DISSIPATION EFFICIENCY; ENERGY-DISTRIBUTIONS; RELATIVISTIC JET; EMISSION; RADIO; SPECTRA; RECONNECTION;
D O I：
10.1088/0004-637X/760/1/69
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results of observations of blazar PKS 1510-089 with the Herschel Space Observatory PACS and SPIRE instruments, together with multiwavelength data from Fermi/LAT, Swift, SMARTS, and Submillimeter Array. The source was found in a quiet state, and its far-infrared spectrum is consistent with a power law with a spectral index of alpha similar or equal to 0.7. Our Herschel observations were preceded by two "orphan" gamma-ray flares. The near-infrared data reveal the high-energy cutoff in the main synchrotron component, which cannot be associated with the main gamma-ray component in a one-zone leptonic model. This is because in such a model the luminosity ratio of the external-Compton (EC) and synchrotron components is tightly related to the frequency ratio of these components, and in this particular case an unrealistically high energy density of the external radiation would be implied. Therefore, we consider a well-constrained two-zone blazar model to interpret the entire data set. In this framework, the observed infrared emission is associated with the synchrotron component produced in the hot-dust region at the supra-parsec scale, while the gamma-ray emission is associated with the EC component produced in the broad-line region at the sub-parsec scale. In addition, the optical/UV emission is associated with the accretion disk thermal emission, with the accretion disk corona likely contributing to the X-ray emission.
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页数：13
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